Insulated electric conductor and method of making same.



No. 669,358. Patented Mar. 5, I91.

I C. P. STEINMETZ.

INSULATED ELECTRIC CONDUCTOR AND METHOD OF MAKING SAME.

(Application filed July 30, 1900.) (No Model.)

Witnesses Jnventor.

,1 I Charles F? Steinmetz,

UNITED I a, STATES PATENT .OFFICE.' a

CHARLES P. STEINMETZ, 0F SOHENECTADY, NEW YORK, ASSIGNOR: To

' GENERAL ELECTRIC COMPANY, OF NEW YORK.

INSULATED ELECTRIC CONDUCTOR AND METHOD OF MAKING SAME.

srncxmda'rxon To (all whom it may concern:

Be it known that 1, CHARLES P. STEIN- METZ, a citizen of the UnitedStates, residing at Schenectady, county of Schenectady, State of NewYork, have invented certain new and useful Improvements in InsulatedElectric Conductors and Methods of Making-the Same, (Case No. 1,285,) ofwhich the following is a specification.

My present lIlVfilllilOIl relates to the insula tion of wire usedprincipally for electrical purposes; and it consists in covering thewire with ast-ructureless coating of cellulose.

. My invention finds a large field of application in connection with thefine wire used in the construction of electrical measuring instrumentsand the like.- 1

My invention renders it possible to coverthe wire with a very thincoating of insulating non-inflammable material, the properties mentionedbeing of particular value in this relation.

The drawingstrepresent a wire coated with insulating material inaccordance with m'yinvent-ion, the wire being indicated at A and the,structureless cellulose covering at B.

In, carrying out my invention I first pass the wire through asolntion ofcellulose made by dissolving the cellulose, preferably in the .form'ofcotton-wool, in an ammoniacal soluforming part of Letters Patent No.669,358, dated March 5, 1901.

Application filed July so, 1900. Serial No. 26,224. on model.)

uid. After the'wire has been passed through this solution it is allowedto dry and then to five parts of water, and is afterward thoroughlywashed with pure water and dried. The dilute acid dissolves out thecupric ampassed through diluted hydrochloric acid in the proportion ofone part of acid, by weight,

inonia and leaves the cellulose upon the wire I in the form of a hornybrownish-gray structureless coating. j e I With larger wire or thickerfilms of cellusubstance to increase its toughness and flexibility.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is..

1'. The method of covering wire which consists in coating it with asolution of cellulose in cupric ammonia, andthen eliminating the cupricammonia in the coating by a suitable solvent. y

2. The method of-covering wire which consists in coating it with'asolution of celluloseincupric ammonia, and then dissolving the cupricammonia in the coating by the application of acid.

3. .The method of covering wire which consists in passing it through-asolution of cell'ulose in cupric ammonia,and then'removing the cupricammonia from the resulting coating.

4. A bare wire covered with a film'ofstruw. .tureless cellulose.

In witness whereof I have hereunto set my hand this 27th day of July,1900.

CHARLES P. STEINMETZ. Witnesses:

BENJAMIN B. HULL,

JAMES J. Hreoms; v

low the coating may, if'desired, be impregnated with linseed-oil orsome'ot-her similar

